I think I narrowed it down to these: v4.14 - No issue observed v4.15-rc-1 - Issue observed
Wherever the issue is observed, if I blacklist or rmmod ahci driver before reboot, no issue is observed (because the SATA ODD is gone now). -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1777674 Title: Ubuntu 18.04 hangs at "kvm: exiting hardware virtualization" on AMD servers Status in dellserver: New Status in linux package in Ubuntu: Incomplete Status in systemd package in Ubuntu: New Status in linux source package in Bionic: Incomplete Status in systemd source package in Bionic: New Bug description: Ubuntu 18.04 hangs at "kvm: exiting hardware virtualization" on AMD servers when under graceful reboot stress for 12hrs. * This hand is observed only when Onboard SATA DVD Drive is connected. * Not seen with Ubuntu 16.04.4 (HWE kernel v4.13) * Seen with Ubuntu 18.04 (4.15.0-23-generic, 4.15.0-20-generic) Steps: Setup a DellEMC AMD server with Onboard DVD Drive, install Ubuntu 18.04 and start reboot stress After a few reboots, observe that the machine hangs at "kvm: exiting hardware virtualization" and does not proceed with reboot cycles. Only physical reset helps in continuing the reboot test. To manage notifications about this bug go to: https://bugs.launchpad.net/dellserver/+bug/1777674/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
